Our package :1 pack Uninflated golf Ball+ 1Pcs inflator to satisfy anyone's needs,Inflatable balls can adjust the size of their own,suitable for different height golf enthusiasts. Upgraded Material: this Golf Swing Trainer made of environmentally friendly flocking PVC.it doesnt need to be fully inflated, enough air to cushion it in between the arms is more than enough, Improve the use of a beginner and professional coach teaching necessary swing auxiliary training artifact. This is a fantastic training aid. With it hanging on the neck, you can use it for say five swings and then use without. It made you use your hands more effectively in the last 1/3 rd of downswing. Effect remarkable:With only a few practices, strengthen the arm muscle memory and your body will automatically responds with the correct swing positions on the golf course. Multifunction: Using this golf intelligent inflatable ball practitioner can correctly grasp the swing posture, fix and strengthen the arm distance muscle memory, avoid arm bending, synchronize your body and arm, effectively improve the swing skills so as to master the correct swing posture, find the right hitting point.